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Fig. 7. Optomotor responses vary with image contrast. (A) Mean responses for
N=30 flies indicated for an unadapted treatment; flies had no prior
exposure to the test stimulus. (B) Mean responses for N=40 flies
indicated for a `same-contrast adapted' treatment; flies were presented with
the test pattern contrast for 7 s prior to the open-loop test (see Materials
and methods). Data are fit with the sigmoid function indicated. The three
function variables were identified with a non-linear least-squares
optimization algorithm (see Materials and methods). Within-subject design
obviates the need for error bars. Variance across animals was similar to that
of Fig. 2.
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